<!DOCTYPE html>
<html lang="en">
  <head>
    <title>参考链接：https://juejin.cn/post/7167355169934409758</title>
  </head>
  <body>
    <a href="#" class="button button--bird">
      <div class="button__wrapper">
        <span class="button__text">ENTRY</span>
      </div>

      <div class="birdBox">
        <div class="bird wakeup">
          <div class="bird__face"></div>
        </div>
        <div class="bird wakeup">
          <div class="bird__face"></div>
        </div>
        <div class="bird">
          <div class="bird__face"></div>
        </div>
      </div>
    </a>
    <style>
      body {
        padding: 100px;
      }
      .button--bird {
        --main_color: #f4cf47;
        --sub_color1: #f4e19c;
        --sub_color2: #ff8108;
        --base_color: #000;
        --border_radius1: 60px 60px 40px 40px / 48px 48px 30px 30px;
        --border_radius2: 70px 70px 40px 40px / 48px 48px 30px 30px;
        --border_radius3: 40px 40px 40px 40px / 48px 48px 30px 30px;
      }
      .button {
        display: flex;
        justify-content: center;
        align-items: center;

        box-sizing: border-box;
        width: 280px;
        height: 80px;

        text-decoration: none;
        border: solid 3px #000;
        border-radius: 40px;
        background: var(--main_color);
        position: relative;
      }

      .button__wrapper {
        display: flex;
        justify-content: center;
        align-items: center;

        width: 100%;
        height: 100%;

        border-radius: 40px;

        overflow: hidden;
        position: relative;
      }
      .button__text {
        position: relative;
        font-size: 32px;
        letter-spacing: 4px;
        color: var(--base_color);
        transition: all 0.3s ease;
      }

      .button::before {
        content: "";
        position: absolute;

        right: 20px;
        margin: auto 0;
        width: 24px;
        height: 24px;
        background: var(--base_color);
        clip-path: path(
          "M24,12.02c0-1.09-.75-1.71-.81-1.77L11.17,.45c-.91-.74-2.21-.56-2.91,.42-.69,.97-.52,2.37,.39,3.11l7.12,5.81-13.7-.02h0C.93,9.77,0,10.76,0,11.99c0,1.23,.93,2.22,2.07,2.22l13.7,.02-7.13,5.78c-.91,.74-1.09,2.13-.4,3.11,.41,.58,1.03,.88,1.65,.88,.44,0,.88-.15,1.25-.45l12.04-9.76c.07-.06,.82-.67,.82-1.77Z"
        );
        transition: all ease 0.2s;
      }
      .button--bird .button__wrapper::before,
      .button--bird .button__wrapper::after {
        content: "";
        position: absolute;
        bottom: 0;
        width: 130px;
        height: 38px;
        background: var(--sub_color1);
        transition: all 0.5s ease;
        clip-path: path(
          "M13.77,37.35L.25,16.6c-.87-1.33,.69-2.91,2-2.02l12.67,8.59c.81,.55,1.91,.14,2.18-.81l2.62-9.33c.39-1.4,2.34-1.42,2.76-.02l3.6,11.99c.33,1.11,1.74,1.4,2.47,.52L49.38,.52c.87-1.04,2.53-.42,2.53,.95V23.7c0,1.13,1.2,1.83,2.16,1.26l12.75-7.51c.85-.5,1.94,0,2.13,.98l1.5,7.6c.2,1.03,1.37,1.51,2.22,.92l17.74-12.3c1.09-.75,2.52,.25,2.21,1.55l-2.44,10.2c-.26,1.09,.74,2.06,1.8,1.75l30.8-9.04c1.37-.4,2.42,1.26,1.49,2.36l-9.07,10.66c-.83,.98-.1,2.49,1.17,2.42l12.12-.68c1.6-.09,2.12,2.15,.65,2.8l-2.73,1.21c-.18,.08-.38,.12-.58,.12H14.97c-.48,0-.93-.25-1.2-.65Z"
        );
      }
      .button--bird .button__wrapper::before {
        left: 0;
      }
      .button--bird .button__wrapper::after {
        right: 0;
        transform: rotateY(180deg);
      }

      .button:hover .button__wrapper::before {
        transform: translateX(-12px);
      }
      .button:hover .button__wrapper::after {
        transform: rotateY(180deg) translateX(-12px);
      }
      .button:hover .button__text {
        letter-spacing: 6px;
      }
      .button:hover::before {
        right: 14px;
      }

      .birdBox {
        position: absolute;
        top: -54px;
        display: flex;
        justify-content: space-between;
        align-items: flex-end;
        width: 180px;
        height: 56px;
      }

      .bird {
        position: relative;
        width: 56px;
        height: 36px;
        box-sizing: border-box;
        border: solid 3px #000;
        background: var(--main_color);
        border-radius: var(--border_radius1);
        animation: sleep 1s ease infinite alternate;
        display: flex;
        justify-content: center;
      }
      .bird__face {
        position: absolute;
        top: 15px;
        width: 12px;
        height: 6px;
        background: var(--sub_color2);
        border-radius: 50% 50% 50% 50% / 78% 78% 22% 22%;
        transition: 0.2s;
      }
      .bird__face::before,
      .bird__face::after {
        content: "";
        position: absolute;
        top: -4px;
        width: 8px;
        height: 2px;
        border-radius: 4px;
        background: #000;
      }
      .bird__face::before {
        left: -5px;
      }
      .bird__face::after {
        right: -5px;
      }
      .bird::before {
        content: "";
        position: absolute;
        top: -12px;
        left: 22px;
        width: 12px;
        height: 12px;
        background: #000;
        clip-path: path(
          "M10.23,3.32c-3.54,.63-5.72,2.51-7.02,4.23-.33-1.58-.34-3.54,.93-5.12,.52-.65,.41-1.59-.24-2.11C3.24-.19,2.29-.08,1.77,.57c-3.82,4.77-.31,11.11-.13,11.42,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0-.01-.02,2.49,.04,2.52,0,.1-.14,1.54-4.82,6.59-5.71,.82-.14,1.37-.92,1.22-1.74s-.94-1.36-1.75-1.21Z"
        );
      }
      .button:hover .wakeup {
        animation: wakeup 0.2s ease;
        animation-fill-mode: forwards;
      }
      .button:hover .wakeup .bird__face {
        top: 20px;
      }
      .button:hover .wakeup .bird__face::before,
      .button:hover .wakeup .bird__face::after {
        animation: eye 5s linear infinite;
      }

      .button:hover .wakeup:nth-child(2) .bird__face::before,
      .button:hover .wakeup:nth-child(2) .bird__face::after {
        animation: eye_2 5s linear infinite;
      }

      @keyframes wakeup {
        0% {
          height: 32px;
          border-radius: var(--border_radius2);
        }
        100% {
          height: 56px;
          border-radius: var(--border_radius3);
        }
      }

      @keyframes eye {
        0% {
          top: -6px;
          width: 6px;
          height: 6px;
        }
        30% {
          top: -6px;
          width: 6px;
          height: 6px;
        }
        32% {
          top: -4px;
          width: 8px;
          height: 2px;
        }
        34% {
          top: -6px;
          width: 6px;
          height: 6px;
        }
        70% {
          top: -6px;
          width: 6px;
          height: 6px;
        }
        72% {
          top: -4px;
          width: 8px;
          height: 2px;
        }
        74% {
          top: -6px;
          width: 6px;
          height: 6px;
        }
        76% {
          top: -4px;
          width: 8px;
          height: 2px;
        }
        78% {
          top: -6px;
          width: 6px;
          height: 6px;
        }
        100% {
          top: -6px;
          width: 6px;
          height: 6px;
        }
      }

      @keyframes eye_2 {
        0% {
          top: -6px;
          width: 6px;
          height: 6px;
        }
        10% {
          transform: translateX(0);
        }
        12% {
          transform: translateX(3px);
        }
        20% {
          top: -6px;
          width: 6px;
          height: 6px;
        }
        22% {
          top: -4px;
          width: 8px;
          height: 2px;
        }
        24% {
          top: -6px;
          width: 6px;
          height: 6px;
        }
        25% {
          transform: translateX(3px);
        }
        27% {
          transform: translateX(0);
        }
        74% {
          top: -6px;
          width: 6px;
          height: 6px;
          transform: translateX(0);
        }
        76% {
          top: -4px;
          width: 8px;
          height: 2px;
          transform: translateX(3px);
        }
        78% {
          top: -6px;
          width: 6px;
          height: 6px;
        }
        80% {
          top: -4px;
          width: 8px;
          height: 2px;
        }
        82% {
          top: -6px;
          width: 6px;
          height: 6px;
        }
        85% {
          transform: translateX(3px);
        }
        87% {
          transform: translateX(0);
        }
        100% {
          top: -6px;
          width: 6px;
          height: 6px;
          transform: translateX(0);
        }
      }
      @keyframes sleep {
        0% {
          height: 36px;
          border-radius: var(--border_radius1);
        }
        100% {
          height: 32px;
          border-radius: var(--border_radius2);
        }
      }
    </style>
  </body>
</html>
